next step is to identify the role of some environmental factors such as air pollution, jobs, disease and smoking on over-production of NO in infertile males. At low concentrations it can have a positive effect on cells, but a negative effect at high concentrations. Men vi har inget som pågår kring det här. Dr Amiri said the infertile men may have had higher concentrations of NO because of male genital tract disease and associated factors, such as inflammation and infection, which can lead to NO over-production. Du läser nu en av dina fria artiklar på, jag tror ingen gör det helt utan egoistiska skäl. They measured levels of NO and used a test that can detect DNA damage and repair in individual cells (single cell gel electrophoresis (comet) assay) to determine DNA damage.